Guided Reading: (see also the Biomes page in the Science Virtual Library)
Level L/M 577 The War in Your Backyard
Level X 363.738 Habitat Destruction Level T 551.48 - The Water Cycle
Level T 551 - The Water Cycle Earth Explorations
Level L/M 551 - The Life and Times of a Drop of Water
ECOSYSTEMS and CYCLES OF MATTER
Guided Reading: (see also the Biomes page in the Science Virtual Library)
Level L/M 577 The War in Your Backyard
Level X 363.738 Habitat Destruction
Level T 551.48 - The Water Cycle
Level T 551 - The Water Cycle Earth Explorations
Level L/M 551 - The Life and Times of a Drop of Water
ECOSYSTEMS AND CYCLES
http://www.naturenextdoor.org/htm%20pages/ecosystempage.htm
http://cnnstudentnews.cnn.com/2001/fyi/lesson.plans/03/30/carbon.dioxide/
http://www.realtrees4kids.org/sixeight/cycles.htm
http://encarta.msn.com/encyclopedia_761582459/Ecosystem.html
http://www.msc.cc.ok.us/~bstewart/bstewart/classes/zoology/ecosystem_ecology.htm
CARBON CYCLE
http://www.visionlearning.org/library/module_viewer.php?c3=1&1=1&mid=95
http://www.physicalgeography.net/fundamentals/9r.html
http://library.thinkquest.org/11226/why.htm
http://www.cotf.edu/ete/modules/carbon/efcarbon.html
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CarbonCycle.html
http://cnnstudentnews.cnn.com/2001/fyi/news/03/30/carbon.dioxide/
http://www.windows.ucar.edu/tour/link=/teacher_resources/teach_carbongame.html
http://www.uwsp.edu/cnr/wcee/keep/Resources/ccgame/background.htm
OXYGEN CYCLE
http://water.me.vccs.edu/concepts/oxycycle.html
http://www.geography4kids.com/files/cycles_oxygen.html
http://pages.nyu.edu/~pet205/oxygen.html
WATER CYCLE
http://www.units.muohio.edu/dragonfly/water/watercycle.shtml
http://ga.water.usgs.gov/edu/watercyclehi.html
NITROGEN CYCLE
http://www.ecologycenter.org/tfs/lesson.php?id=13510
http://www.cst.cmich.edu/centers/mwrc/nitrogen.htm
POLLUTION
http://www.abc.net.au/cgi-bin/common/printfriendly.pl?/science/news/stories/s436889.htm
http://www.uwsp.edu/cnr/wcee/keep/Mod1/Flow/Greenhouse_Gas.htm
http://www24.studyisland.com/lessWin.cfm?lcfid=1&CFID=13985259&CFTOKEN=244
http://library.thinkquest.org/C0111040/Popups/pop_table_air1.htm
http://library.thinkquest.org/C0111040/Types/radio.php
http://library.thinkquest.org/C0111040/Popups/pop_table_water1.htm